Thundery showers are expected in the second fortnight of October, due to the prevailing inter-monsoon conditions over Singapore and the surrounding region.Short-duration thundery showers are expected over parts of the island in the afternoon on most days, said the Meteorological Service Singapore on Thursday (Oct 16).Winds are forecast to be mostly light and variable in direction.In addition, Sumatra squalls may bring widespread thundery showers and gusty winds during the predawn hours and morning on some days.Sumatra squalls are lines of thunderstorms that develop over Indonesia's Sumatra island or the Strait of Malacca and move eastward across the strait, bringing heavy rain and gusty winds to Singapore and Peninsular Malaysia.According to the Met Service, the total rainfall for the second half of October is forecast to be above average. Read more